What do you mean by "social diet"?
I'm the wrong guy to go to for justifications of how congregations behave these days, meaning, in these times. But, I think I'm qualified to comment on the Bible's instruction to the church. So, that's all I'm trying to do.
We think of 'church' as a building or a group or a social event. The Bible defines the church in literal terms as the body of Christ on earth. When you become a believer, you are endowed with the Holy Spirit, who dwells within you. He bears a new life within you, destined to grow and overtake your old life.
That's one impact. Another is that you are assigned an active role in the body. This is the true meaning of becoming a 'member' of the body of Christ. This is repeatedly stated in the most literal terms. In fact, upon rebirth, you are given abilities which you are to utilize in your assigned duties. No denials; you've been assigned.
Like a liver, kidney, hand, eye, mouth, you have a role to play. That role will contribute to the overall health and mission of the body. The Holy Spirit has gifted and assigned everybody in such a way that all pieces supply one another with everything that's needed for good health.
Which isn't to say not to go out into the world; rather, it's an explanation of how the Holy Spirit is the forming and guiding principle in the body of Christ, a self-contained unit. Within the body, you get all the social nutrients needed for good health.